Lifting-jack



No. 751,336. vPATENTED EEB. 2, 1904.

. M. v. E. PERKINS & G. Y. PATTERSON.

LIFTING JACK.

APPLIUATION FILED 111111.26. 1903.

No MODEL. 2 SHEETS-SHEET 1.

J8 z!//////////////////// |1|| L 11| No. 751,336. PATENTBD PEB.'2, 1904.M. v. H. PERKINS G. Y. PATTERSON.

LIFTING JACK;

rrLIoArIol Hum In. as. 1903.

2 VSHEETS-SHEET 2.

I0 MODEL.

UNITED vSTATES u -Iatented February 2, 1904.A i

PATENT f OEEICE.

MARTIN vJII, PERKINS, OE NEW YORK, AND GEORGE Ir.` PATTERSON, OE

BROOKLYN, YORK.

LlFTlNG-JACK.

A SPECIFIGAIIONy forming part of .Letters Patent N o. 751,336, datedFebruary 2, 1904.

. 'York, both citizensof theUnit'ed States, have invented certain newand useful Improvef ments in Lifting-Jacks, of lwhich the following is aspeciiicationl- Thisinvention comprises improvements in liftingjacks,the details of which Will be pointed out in the following pspecification, taken in connection with the 'accompanying drawings, inwhichf Figure 1 is a central vertical section through the lifting-jack.Fig. 2 is a section on the line 2 2 of Fig. 1'. Fig. 3v is a side viewof the ratchet device for operating the jack. Fig. 4 is asimilar View ofthe pawl and the slide in which the pawl is mounted, and Figxv is a planview of the ratchet-wheel.

Referring to the drawings, A indicates a standard of suitable formhaving a.l circular socket or recess 1 at its upper end and a centralcylindrical opening 2, which extends downwardly through the center ofthe standard from said socket. Within the vertical opening 2 is arrangeda lifting-screw B, which is Supported and operated by a worm-wheel 3,the .latter being arranged in the recess or socket 1 upon ball-bearings4. Thethreads 5 of the liftingscrew engage corresponding threads in theworm-wheel, and when the lat' ter is rotated the lifting-screw, which isprevented from rotating by the load upon it, is

raised or lowered, according to the .direction of rotation Avoftheworm-wheel. A head or end ofthe screw 'by means of threads 6 upon thescrew, which are reversed in direction with respect to the threads 5,and the head of the screw is preferably riveted Aover at the top, as

indicated by the numeral 7. The worm-wheel has an'extended hubB, whichpermits the Wheel to ybe engaged by a y.sufficient number of threads to.readily withstand the maximum load. An annular channel 8 is formed inthe base of the wheel, and within this channel is.

, Application filed March 26, 1903. SerialNo. 149,662. (No model.)

fitted an annular bearing 9, of hardened steel, havingv thereon lugs orprojections 10, which fit into `sockets or depressions in the base ofthe channel andl prevent the bearing from slipping around in thechannel. A similar bearing `il is located in a channel 8 in the bottomof the recess A1 in the standard. Race- Ways 11l are formed in theadjacentjfaces of the bearings, the Walls `12 and 13 of 'each race; Waybeing at right angles to one'anothcr and at an angle of about'forty-vedegrees to the plane of rotation of the wheel. The balls therefore.touch the corresponding walls of both raceways at points in verticallinesat oping 2 is arranged a receptacle D for lubricating material,this receptacle-consisting of a cup or cylinder d, which surrounds thescrew and has a threaded connection with the walls of said opening, saidcylinder'being closed at 'its lower end and open at its upper end. I Anannular re ess orA Socket 2b is formed in the bottom of t e standard,surrounding the vertical opening and forming therewith a shoulder 14.The lower end of the receptacle is enlarged, forming a circular head 15,winch fits into the socket 2b,'and between said head and the shoulder-14 is arranged a gasket 16,

which effectually prevents the escape of oil or other lubricant whichmay leak down around the receptacle.' The head 15 of the receptacle liesflush with the bottom; of the standard and serves as a part of the baseof thestandard.

A pin extends diametricall'y through the lower end of thelifting- Screw,and its projecting ends formf Stops which engage the shoulder 14hA andvlimit the-upward 'movement n v of thescrew. l

.- The interior ofv the standard or casing is rendered' as nearly aspossible' dust-proof'by means ofv a cover-plate 17, which extends overthe wall oftheannular recess .1, and agasket 18, arranged beneath theplate.

secured to the inner end of the sleeve rand.

adapted to hold the balls in place'when the shaft is removed. The ballsbear against the interior face of a sleeve 25, which is screwed into athreaded recess in the casing and abuts against a shoulder 26. Theinterior wall of the sleeve 25 converges toward its outer end. The partsof the bearing F are the same in construction as the partsmof thebearing E; but the outer sleeve 25 of the bearing F instead of abuttingagainst a shoulder which would limit its movement'may be adjustedlongitudinally of the shaft to compensate for wear, and it is providedwith a lock-nut 27, which secures the sleeve in its adjusted position.When it is desired to remove the shaft, it is simply necessary tounscrew the nut 27 and the sleeve 25,

when the shaft may be taken out, the balls being held in place by theball-retainers. The latter, it may be noted, do not come in contact withthe balls when the shaft is in position. The ratchet-wheel, as shown inFig. 5, has a'polygonal opening in the center, through which acorrespondingly-shaped end portion of the shaft extends. The ratchetlever or handle 28 is provided with forked arms 28 and 28", which arejournaled on the shaft at opposite sides of the ratchet-wheel, and thelever and ratchet-wheel are held against endwise movement upon theshaftbetween a shoulder 29 and a' Cotter-pin 30 or other suitable retainingdevices. A ratchet mechanism G, comprising a slide 33 and a pawl 37,pivoted thereto, is arranged within verticalland horizontal guide-slots31 and 32, which intersect one another in the ratchet-lever near itsinner end. The slide 33 is arranged within the vertical slot 31. vThisslide has two parallel arms v3a, and a pin or shaft V35 extends throughand is journaled in said arms. A knob or handle 36 is secured upon oneend of said shaft. The pawl 37 is removably secured to said shaftbetween the arms of the slide and 4within the 'guide-slot 32. Thev pawlis wide enough to extend "across the slot 31, so that the pawl serves asa guide for the slide 33 and prevents lateral displacement of the slide.The pawl and slide may be removed by unfastening the pawl from theshaft`35 and removing the latter. The shaft 35 extends through thecenter of the pawl, and the ends of the pawl are provided with cam-faces38, sloping in opposite directions, the opposite sides 39 of each endbeing straight. The cam is normally -having a-worm thereon engaging saidworm- -reverse the position of the pawl by giving the knob 36 asemirevolution. v

Having described our lnventlon, what we claim, and desire to secure byLetters Patent,

1.. In a lifting-jack, a standard or casing,-a

worm-wheel horizontally arranged within the casing, a lifting-screwextending centrally through. the worm-wheel and having a threadedengagement therewith, a worm-shaft having thereon a worm engaging saidwormwheel, aA ratchet-wheel secured to said shaft, and means foroperating said ratchet-wheel comprising alever journaled upon the shaft,a slide carried by said lever,-a spring normally pressing said slidetoward the ratchetwheel, and a centrally-pivoted pawl carried by saidslide and having its opposite ends suitably formed to engage and movethe ratchetwheel in opposite` directions.

2. In a lifting-jack, a standard or casing, a worm-wheel horizontallyarranged within the casing, a lifting-screw extendingA centrally throughthe worm wheel andy having a threaded engagement therewith, a worm-shafthaving a worm engaging said worm-wheel, a 4ratchet-wheel secured to saidshaft, and means for operating said ratchet-wheel comprising a l lever'journaled upon the worm-shaft, said 1ever having intersecting "slotsnear its inner end, a slide in one ofsaid Slots, a pawl arranged -in theother slot and pivotally connected to said slide, and a spring normallypressingV said slide toward the ratchet-wheel. 3. In a lifting-jack, astandard or casing, a worm-wheel horizontally arranged within thecasing, 'a lifting-screw extendingl centrally through the worm wheel andhaving a threaded engagement therewith, a worm-shaft wheel, aratchet-wheel secured to said shaft, and means for operating saidratchet-wheel comprising a lever having forked arms journaled upon theshaft at opposite sides of the ratchet-Wheel, said lever havingintersecting slots near its inner end, a slide in one of said slots, apawl in the other slot and pivotally connected to said slide, and aspring normally pressing said slide toward the ratchet-wheel.

4:. In a lifting-jack, a standard or casing, a worm-wheel horizontallyarranged within the casing, a lifting-screw extending centrally throughthe, worm wheel and' having a threaded engagement therewith, aworm-shaft having al worm engaging said worm-wheel, a

IOO

ratchet-wheel secured to said shaft, and means l for. operating saidratchet-wheel comprising a `lever j ournaled uponjthe Worm-shaft, saidlever having intersecting slots near tsinner end, a slide arranged inone of said slots and having forked arms, a shaft or pin journale'd insaid forked arms, a reversible pawl arto said pin, and a spring normalsaid slide toward the ratchet-wheel. 5.l -In a lifting-jackfa base orstandard havranged in the other of said slots and secured ly pressinging an opening extending therethrough, and a socket at each end of saidopening, a worm- `wheel arranged in the upper socket, a liftingscrewextending through and supported by Said worm-wheel, and a lubricatingcup or re I`-ceptacle extending upwardly into said openling.l from thebase of the standard and sur-l rounding thev lower part of the screw,said receptacle. having a head at its lower end4 fitting vinto lthelower socket in the standard.

6. In a lifting-jack, a base or standard having an opening extendingtherethrough and a socket at each end of 'saidopening, a worm-v VWheelarranged in the upper socket, a coverplate extending over said socket, aliftingscrew'extending through and supported by.

said worm-wheel, and a lubricating cup or receptacle extending upwardlyinto said opening from the-base of the-standard and surrounding thelower part of the screw, said receptacle having a head vat its lower endfitting into the lower socket in the standard.

7. In a lifting-jack, a standard or casing havinga vertical opening, lalifting-screw vertically arranged in said standard, ahorizontallyarranged Wheel supporting said screw and having athreadedconnection therewith, said wheel `being rotatable about the screw Vandhaving an annular ball-raceway o'n its lower side, said standard alsohaving an opposing ball-raceway, and balls within said raceways, thewalls of .each of said raceways being a1'- ranged to engage the balls attwo points on opposite sides. of their vertical diameters. 8. In alifting-jack, a standard or casing having a socket in its upper end, anannular groove or channel in the base of said socket and a verticalopening extending downwardly from said socket, a wheel arranged withinsaid socket and having an annular groove in its lower face', alifting-screw extending through the hub of `gsaid wheel, said wheelbeing rotatable on the screw, annular bearings arranged within thechannels of the wheel and socket, said bearings having 'raceways, thewalls of which-are4 arranged substantially at right angles 'to oneanother, and balls arranged-within said race- 49. In a lifting-jack, thecombination with the baseor standard, the lifting-screw and theworm-Wheel threaded upon said screw, of a worm -shaft having vawormengaging said wheel', and ball-bearings for said worm-shaftcomprising sleeves secured to .the shaftat opposite ends of the Wormand'having annular grooves therein, balls in said grooves,ball-retainers secured tothe sleevesand adapted to hold the balls inplace, taperingsleeves'or shells fitting into 'suitable openings in thestandard and extending aroundthe balls, one `of said tapering `sleevesbeing fixed/in position andA the other sleeve'being adjustable, and!

